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Full text of "Text Book Of Mechanical Engineering"

272                        Setting the Eccentrics.

red ochre applied to its journals. Being turned round in the
bearings by means of the temporary handles, L, it is lifted away,
the brasses scraped, and the method repeated until a perfect fit is
obtained. The last time the shaft is removed, it is taken to the
marking table to line the eccentric key ways. The angles for each
sheave are shewn at M, being known after design, and are there
called a and ft; x and y are therefore found from a table of natural
sines.

For   oc = radius of shaft x sin a,  and y = radius of shaft x sin fi.

TABLE OF NATURAL SINES FOR ANGLES UP TO 45.

DK-
	Sine.
	Deg,
	Sine.
	Deg.
	Sine.
	Dcg.    Sine
	
~r
	008/2
	12
	20791
	23i
	*39875
	35 j "57357
	

	01745
	12*
	'21644
	24
	40673
	35* I -58070
	
4
	02617
	13
	22951
	24 1
	41469
	36   -58778
	
I
	03489
	13*
	23344
	25
	42262
	36J
	59482

2*
	04362
	H
	24192
	25*
	"43051
	37
	60181

2
	05233
	Mi
	25038
	26
	43B37
	37i
	60876

3*
	'06104
	J5,
	25882
	26*
	44619
	38
	61566

3
	06975
	'5*
	26724
	27
	'45399
	38i
	'62251

4*
	'07846
	16
	27563
	27*
	46175
	39
	62932

4
	08715
	16*
	'28401
	28
	46947
	39i
	63607

5*
	09584
	17
	29237
	28*
	47715
	40
	64278

5
	*0453
	17*
	30070
	29
	'48481
	4oi
	'64944

6*
	11320
	18
	30901
	29^
	49242
	41
	65606

6
	12187
	18*
	'31730
	30
	5OOOO
	4^
	66262

7*
	13052
	19
	32556
	30*
	50753
	42
	66913

8
	"I39I7
	19*
	33380
	31
	"5* 53
	42|
	67559

8*
	-14781
	20
	'34202
	31*
	52249
	43 | "68200
	
9
	15643
	20*
	35020
	32
	53992
	43i
	68835

9*
	16504
	21
	' 35836
	32*
	*5373o
	44
	69465

10
	17364
	21*
	36650
	33
	54464
	44i
	70091

10*
	-18223
	22
	37460
	33*
	55193
	45
	70710

II
	19081
	22*
	38268
	34
	55919
	
	

I 1*
	19936
	23
	39073
	34*
	'56640
	
	

The heights x and y above or below centre line have to be scribed
by laying the crank webs vertically or horizontally a$'~at p and w,
and the distance Q also measured, giving the centre line between
the two eccentric rods. Slot-drill the keyways. Then drive the
sheaves upon the shaft, to which they should fit tightly; put in
the keys, and replace the crank in its bearings, (It may be noted